If you don't know what this game is about, it's probably not a game for you.
Apparently, this is actually quite a cool game if you're learning kanji, want to revise your kanji or simply just already know kanji. I want to play it someday but right now I suspect the kanji level is too high for me.
I'm not sure what the story is about but it's probably not that important anyway. The basis idea of this game is that as you encounter bad guys, you have to write the correct kanji, or the correct pronunciation or the correct word count etc in order to defeat them. In concept, it sounds similar to another kanji game which was set in the martial arts world or something.